hopkinson



N0. 6l|,484: Patented Sept. 27. I898. v.l. HDPKINSON.

STOP- VALVE.

(Application'filerl Dec. 20, 1897.) (No lllndel.) 2 Sheets-Sheet l.

Patented Sept. 27, I898.

No. 6ll,484.

' J. HOPKINSON.

STOP VALVE.

(Appliction filed Dec. 20, 1897.;

2 5he ets-Sheet 2.

(N0 Modal.)

Nrrn STATES FFlCEt JOSEPH HOPKINSON, OF HUDDERSFIELD, ENGLAND, ASSIGNOR TO J. HOPKINSON 85 00., LIMITED, OF SAME PLACE.

STO P-VALVE.

SPECIFICATION forming part of Letters Patent No. 611,484, dated September 27, 1898.

Application filed December 20, 1897. Qerial No. 662,670. (No model.)

To all whom. it may concern.-

Be it known that I, J OSEPH HoPKINsoN, engineer, a subject of the Queen of Great Britain, residing at Britannia Works, Huddersfield, in the county of York, England, have invented certain new and useful Improvements in Stop-Valves, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to stop-valves with removable seats that is to say, seats formed in a part which is separable from the valve body or casing; and the said invention has for its objects to insure fluid-tight joints between the metal of the removable part and that of the casing and to facilitate the insertion and removal of the valve and seat when necessary. The part in which the valve-seat is formed is a cylindrical frame or cage wherein the valve is inclosed. The upper end of this cage has an annular surface accurately fitted in the neck of the casing immediately below the cover, and its lower end is seated on the diaphragm or part of the casing which separates the inlet and outlet passages. The cage is so constructed as to allow a free passage of the water or other fluid through it. In valves provided with seats of this kind it and lower parts of the cylindrical frame or cage. Stop-valves have been made with removable seats which have the cage or frame secured by screw-threads in the neck of the casing. Others have had the cage provided with packing at the upper end so arranged that when the cover is screwed down to secure the seat in its place it presses upon a ring of packing at the saidupper end; but these and other arrangements heretofore adopted have not proved satisfactory. I have therefore sought to accomplish the desired result by totally-different means, which will now be described by the aid of the accompanying drawings, in which Figure 1 is a vertical longitudinal section of a stop-valve. Fig. 2 is a transverse vertical section of the casing, taken on the line 1 1 of Fig. 1. Fig. 3 is an elevation of the cylindrical frame or cage detached. Fig. 4 is a horizontal section of the same, taken on the line 2 2 of Fig. 3. Fig. 5 is a longitudinal vertical section showing a modification of my invention.

Like letters indicate the same parts throughout the drawings.

The body or casing a is constructed of any required material and dimensions and is suitably formed to receive the cage 1), in the lower tion, as will be understood from the followingdescriptionthat is to say, according to this invention I dispense with screw-threads and with packing-boxes or other contrivances which necessitate the attachment of the cage to the casing'otherwise than by the simple contact of their surfaces, and by the employment of taper or conical surfaces at the upper end of the cage, in combination with the lower end thereof seated on the part 0L2 of the casing, I avoid'the difficulty usually experienced in attempts to obtain fluid tight joints at two different parts with surfaces at different anglesto each other.

In the form of my invention illustrated in Fig. l the aforesaid annular portion b of the cage is made taper on its outer and inner peripheries, its largest diameter being at the top and its smallest outside diameter being somewhat larger than the interior of the neck a, so that the entire cage can be readily inserted into the casing and withdrawn therefrom when required. The interior of the neck is made taper to receive the exterior surface of the cage, as shown. The inner surface of this annular portion 19 of the cage 1) is preferably tapered at anangle less than that of the outer surface. The cover 0 of the casing is formed with a central boss 0, through which the valve-spindle works and which is made taper to fit the inner taper surface of the annular portion 19 of the cage. The taper annular portion 11 of the cage is thus fitted to and between the inner taper press the lower end of the cage closely and tightly into contact with the surface on which it is seated and will at the same time force the aforesaid conical or taper surfaces into close contact with each other, thereby insuring sound fluid-tight joints at both ends of the cage.

The removal of the seat can be readily effected at any time by lifting or pulling the cage endwise from the casing when the cover 0 is unscrewed. To facilitate its removal, I prefer that the inner surface of the annular portion b of the cage should be tapered at an angle less than that of the outer surface, as above described, as when the surfaces are so formed the cage will come outwith the cover when the latter is removed.

I provide the upper end of the cage 1) with a small flange or projection 12 under which, if necessary, a chisel or other suitable implement can be applied to facilitate its removal from the casing.

In some instances the annular portion at the upper end of the cage maybe made taper on the outer surface only, the cover being arranged to press upon the outer end of the said cage.

According to a modification of my invention I form the taper or inclined surfaces at the upper end of the cage as follows, viz: I form on the upper surface of the recess in the cover of the casing a V-shaped annulus or ring (1, the apex of which projects into an annular groove between the cage and the easing, as shown in Fig. 5. Therefore when the cover a is screwed down upon the neck the result will be the same as that above described-21c. the endwise pressure will insure the tightness and soundness of the joint between the seat and the casing at the upper and lower ends of the cage.

What I claim is 1. In a stop-valve the combination with the valve-cover of a removable seat frame or cage having at its upper end conical surfaces to engage respectively with conical surfaces on the valve-cover and on the valve-casing and having at its lower end a seating-surface to bear against a shoulder on the valve-casing whereby fluid-tight joints are insured at both ends of the cage, substantially as described.

2. In a stop-valve the combination with a cover through which passes the screw-spindle carrying the valve; of an inwardly-projecting conical boss on said cover; of a removable seat frame or cage having two conical surfaces at its upper end, one of which bears against the conical boss on the cover and the other of which bears against a conical surfaceon the Valve-casing, the said cage also having at its lower end a seating-surface to bear against a flange or shoulder on the valvecasing, substantially as described.

3. In a stop-valve the combination with the cover through which passes the screw-spindle carrying the valve, of a removable cage having two conical surfaces at its upper end adapted to engage respectively with a conical boss on the cover and a conical surface on the valve-casing, of a flange (such as 6 at the upper end of the cage for enabling the latter to be lifted when desired by a suitable tool, and of a seating-surface at the inner end of said cage to bear against a shoulder on the Valve-casing, substantially as described.

In testimony whereof I have hereunto set my hand this 6th day of December, 1897.

JOSEPH HOPKINSON.

Witnesses:

GEORGE HELM, CARTER HOYLE. 

